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LLDP Agent
Issue 1 July 2006 147
attached to the same LAN. These can all be reported to management stations via IEEE-defined
Simple Network Management Protocol (SNMP) Management Information Bases (MIBs).
LLDP information is transmitted periodically. The IEEE has defined a recommended
transmission rate of 30 seconds, however, the transmission rate is adjustable. LLDP devices,
after receiving an LLDP message from a neighboring network device, stores the LLDP
information in an SNMP MIB. This information is valid only for a finite period of time after TLV
reception. The time is defined by the LLDP Time to Live (TTL) TLV value that is contained within
the received packet, unless refreshed by a newly received TLV. The IEEE recommends a TTL
value of 120 seconds, but you can change it if necessary. This ensures that only valid LLDP
information is stored in the network devices and is available to network management systems.
LLDP information is associated with the specific device that sends it. The device itself is
uniquely identified by the receiving party via both received chassis ID and port ID values.
Multiple LLDP devices can reside on a single port, using a hub for example, and all of the
devices are reported via MIB. You can enable (Rx and TX, Rx or Tx) or disable LLDP operation
on a per-port basis.
Supported TLVs
Mandatory
● End-of-LLDPDU
● Chassis ID
● Port ID
● Time to Live
Optional
● Port description
● System description
● System name
● System capabilities
● Management address
802.1 (optional)
● VLAN name
● Port VLAN